Start Killer is a small software to hide the Start button, located in the bottom left corner. When the software is running, Start button akan "disappear" from the taskbar and you will get a little extra space on the taskbar.

Although there is no Start button, you can still access the Start menu by pressing the Ctrl key + ESC or Windows key.

To display the Start button again, you should close the Killer Start by clicking the right icon on the Start Killer systray menu and click Exit.